start services separately

[wickett]

The function bundle exec start_services is great but it would be cool to also have bundle exec start_service my_service_name

Not sure if that is possible, but that could be pretty cool. It allows the tester to fire up just one service instead all of them...

[cbusbey]

We have a branch that allows selective start/stop/restart of services. Here is the relevant commit: connamara@cf3177f

We also had a use case for assigning services to groups, which made it easier to select those services (this is also included in the above commit). This has only been used within cucumber, so support would still need to be added for the start_service script. Happy to contribute this back if appropriate.